Does topical NAD+ work in skincare?
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Topical NAD+ is hard to deliver: at about 663 daltons, strongly hydrophilic, charged and unstable, it is a poor candidate to reach living epidermis from a conventional aqueous serum. Encapsulation helps, and a 2025 ex vivo study found liposomal NAD+ penetrated 30% better than unencapsulated NAD+. A controlled trial showing visible skin improvement from passively applied NAD+ at cosmetic levels has not been established.
What is NAD+?
Nicotinamide adenine dinucleotide is a coenzyme present in every living cell. It carries electrons in the reactions that turn food into usable energy, and it is consumed as a substrate by enzymes involved in DNA repair and stress response, including PARPs and sirtuins. It is not a vitamin or an antioxidant in the usual cosmetic sense - it is a metabolic cofactor, which is why its evidence has to be read differently from most skincare ingredients.
Also known as nicotinamide adenine dinucleotide, beta-NAD, DPN. CAS 53-84-9.
What it is used against
- appearance of fine lines
- appearance of elasticity and firmness
- cellular energy metabolism support
Which name means what?
Five similar names describe different molecules. NAD+ is the coenzyme itself, about 663 daltons. Nicotinamide - also called niacinamide, the form you see at 2 to 10% in serums - is a 122-dalton vitamin B3 derivative and a precursor to NAD+, with its own substantial evidence base. Nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) are larger precursors mostly studied orally. Niacin (nicotinic acid) is a different B3 form again. The strong clinical evidence for niacinamide is frequently borrowed to support NAD+ claims; the two are not interchangeable.
Can NAD+ get through the skin barrier?
Three properties work against NAD+ crossing the stratum corneum: roughly 663 daltons, above the widely cited 500-dalton threshold; strongly hydrophilic and charged, which is unfavorable for partitioning into a lipid barrier; and unstable, since extracellular NAD+ is rapidly metabolized.
So in a conventional aqueous serum, NAD+ is a poor candidate to reach living epidermis in useful quantity. If a product claims a topical NAD+ effect, the delivery system is doing the decisive work.
Encapsulation is the direct answer, and it is no longer merely plausible. A 2025 study applied a liposomal NAD+ formulation to ex vivo human skin explants and measured NAD+ in the tissue directly by infrared spectroscopy, finding 30% greater penetration than unencapsulated NAD+ at the same concentration. The same formulation reduced senescent-cell counts by 28.7% in endothelial cells and 15.4% in keratinocytes.
Three things that study does not establish. It tested liposomes, not multi-layer biopolymer encapsulation - the principle carries, the specific performance does not. The 30% is relative to a molecule that penetrates poorly to begin with, with no absolute figure reported. And it used explants from a single donor, ex vivo, over 24 hours.
What does the evidence support?
Exogenous NAD+ does something once it reaches cells: a 2024 study in human fibroblasts found it protective against both UV-induced and intrinsic aging, and identified CD38 - an enzyme that degrades NAD+ - as a limiting factor, with inhibition amplifying the effect.
Clinically, a 2026 case series in 36 patients found topical NAD+ effective and well tolerated in mixed-type melasma over 21 weeks. The important detail is that delivery was microneedling-assisted rather than passive. That supports the penetration argument rather than contradicting it.
For oral precursors the evidence is strongest of all: a placebo-controlled trial found oral NR raised the muscle NAD+ metabolome and lowered inflammatory cytokines, and oral NMN safely raises blood NAD+. Those are systemic endpoints, not skin.
Still unestablished: that passively applied topical NAD+ produces a measured improvement in the appearance of living human skin in a controlled trial at cosmetic use levels. Penetration and clinical benefit are separate claims.
What should you ask of a product?
Which molecule is in it - NAD+, NMN, NR or niacinamide? What keeps it stable, and what is the tested shelf life? What delivery system is claimed, and is there penetration data for that system with that molecule rather than a smaller stand-in? Did the study measure NAD in skin, or consumer perception? Was it independent, and was the product tested as sold?
Is NAD+ safe?
Well tolerated topically at cosmetic levels, with no characteristic irritancy profile and no photosensitising behavior requiring night-only use. Pregnancy and breastfeeding questions belong with a clinician rather than an ingredient page.
The ratings below use the same vocabulary as the rest of the site, so a reader sees one set of terms throughout.
| Who or what | Rating | Why |
|---|---|---|
| Children | ok | No characteristic irritancy profile at cosmetic levels. |
| Applicator | ok | Well tolerated topically; no photosensitising behavior requiring night-only use. |
| Pregnancy and breastfeeding | caution | Not a known hazard, but pregnancy and breastfeeding questions belong with a clinician rather than an ingredient page. |
What conditions change the outcome?
Unstable in aqueous formulation; extracellular NAD+ is rapidly metabolized. Requires a stability system and, for any penetration claim, a delivery system with its own data.
Key takeaways
- NAD+ is a metabolic coenzyme present in every living cell, not a vitamin or a conventional antioxidant.
- At about 663 daltons it sits above the widely cited 500-dalton threshold for skin penetration.
- Niacinamide, a 122-dalton NAD+ precursor, has its own evidence base and is not interchangeable with NAD+.
- In a 2025 ex vivo study, liposomal NAD+ penetrated skin explants 30% better than unencapsulated NAD+.
- Penetration and visible clinical benefit are separate claims.
References
The studies below describe the ingredient itself. Finished-product results appear in each product's evidence dossier.
- Ministrini et al., liposomal NAD+ formulation, Current Issues in Molecular Biology 47(9):722, 2025
- Boosting Pharmacological Effects of Exogenous NAD+ by Synergistic Inhibition of CD38, Cells 2024
- Yi, Wan & Hwang, Topical NAD+ Skinbooster for Melasma, Aesthetic Plastic Surgery 50:4431-4436, 2026
- Ex Vivo Transdermal Delivery of NMN Using Polyvinyl Alcohol Microneedles
- A topical lipophilic niacin derivative increases NAD, epidermal differentiation and barrier function in photodamaged skin
- Bos & Meinardi, The 500 Dalton rule for skin penetration, Experimental Dermatology 2000
- Nicotinamide riboside augments the aged human skeletal muscle NAD+ metabolome
- Oral NMN is safe and efficiently increases blood NAD+ levels in healthy subjects
- Enhancing Dermal Absorption of Cosmeceuticals, Journal of Cosmetic Dermatology 2025
Frequently asked questions
Is NAD+ good for skin?
Exogenous NAD+ does something once it reaches cells: a 2024 study in human fibroblasts found it protective against both UV-induced and intrinsic aging. Whether passively applied NAD+ produces a measured improvement in the appearance of living human skin at cosmetic levels has not been established in a controlled trial.
Is NAD+ the same as niacinamide?
No. NAD+ is the coenzyme itself, about 663 daltons, while niacinamide is a 122-dalton vitamin B3 derivative and an NAD+ precursor with its own substantial evidence base. The strong clinical evidence for niacinamide is often borrowed to support NAD+ claims, but the two are not interchangeable.
What should you look for in an NAD+ serum?
Check which molecule it contains (NAD+, NMN, NR or niacinamide), what keeps it stable, and its tested shelf life. Ask what delivery system is used and whether there is penetration data for that system with that molecule. Look for studies that measured NAD in skin, were independent, and tested the product as sold.
Related reading
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Products
No direct product mapping. Nothing in the Vegalab range declares NAD+ in its composition, so this page has no product link - the absence is deliberate, not an omission.